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- Pump Size = (Flow Rate x Total Head) / (75 x Efficiency x Fluid Density) In plain English, the formula means that the Pump Size is calculated by multiplying the Flow Rate and Total Head and dividing the result by the product of 75, Efficiency, and Fluid Density.
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Example - Power pumping Water, Imperial Units. 600 gpm of water is pumped a head of 110 ft. The efficiency ofthe pump i s 60% (0.6) and the specific gravity of water is 1. The pump shaft power can be calculated as. Ph (kW) = (60 gpm) (110 ft) (1) / ( (3960) (0.6)) = 27.8hp.
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2017年9月11日 · how can you calculate a pump requirement for a water pumping system in the following arrangement flow rate of 17 L/min, viscosity of water , 38m of 1/2” ID piping with a 10m lift and also include joints and explain how you might calculate looses in those joints.
- Overview
- Calculating Water Horsepower for a Planned Project
- Measuring a Pump's Water Horsepower
All the measurements and equations required to determine how much power you need
A pump is a basic but vital device that supplies the force to move water or other fluids from one location to another. Like any device that transfers energy across a distance, a pump’s effectiveness is measured in power. Although watts and kilowatts are more common units of power measurement, horsepower is still commonly used for high-output electrical devices in the United States. We’ll show you how to calculate the horsepower you need before installing a pump, as well as how to measure the horsepower of an existing pump.
TDH = Total Dynamic Head = Vertical distance liquid travels (in feet) + friction loss from pipe
Q = flow rate of liquid in gallons per minute
Decide on the desired flow rate.
The needs of your project determine the necessary flow rate of liquid from the pump. Write this value down in gallons per minute (gpm). You won't be using this value right away, but it will determine which pumps and pipes you consider.
In other words, you need to know how much water you need to move per minute, which will vary by project. Refer to
for common flow rate estimates.
A gardener has an irrigation plan that requires a flow rate of
Measure the height the water needs to travel.
Check the water level in the base reservoir tank.
This is the tank that supplies water for your pump. The water level in the tank will also equal the water level in the pipe, so this is the level the pump is currently drawing from. Read the indicator on your reservoir to find this.
If you are pumping from a well, either measure the depth directly or look for an estimate of water table levels in your area (at this time of year). Government agencies such as the USGS can often provide this information.
The destination reservoir is a second tank, to which the pump transfers water from the base reservoir. Make sure it is empty and connected properly to the pump.
If you do not normally have a tank here, just put down a large bucket to collect the water for this measurement. Use a bucket of known size in gallons.
Measure the vertical distance between the two locations.
Pump Power calculation Formula: Pump power P (kW) in kilowatts is equal to the product of the rate of flow q (m 3 /hr) in cubic meter per hour, fluid density ρ (kg/m 3 ) in kilogram per cubic meter, gravity g in m 2 /s, pump differential h (m) head in meter and the differential pressure p (Pa) in Pascal or N/m 2 divided by 36,00,000.
FluidTemp.(deg. C)Density(kg / M3)Vapour(pressure Kpa.)Acetaldehyde20788105Acetaldehyde30748148Acetic acid2010483.3Acetic acid anhydride2010841.3Online Pump Power calculator. Pump Power. Pump Formulas Calculator — Imperial and SI Units. Select a Sytem Units. Imperial Units. SI Units. Imperial Units H = pump head, ft// SI Units H = pump head, m. Q. Imperial Units Q = flow, gpm// SI Units Q = flow, m3/hr. SG = specific gravity. η = pump efficiency, decimal. P = power.
Water pump calculations. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Calculate Pressure Head, Total Dynamic Head, Bowl Horsepower, Total Trust acting on Driver Thrust Bearing, Field Head, Power Loss due to Shafting, Power Loss in Thrust Bearings, Motor Load, Field Efficiency, Input Horsepower (Power Supplied to Driver) and ...
•pumped water-like fluids: <1.5 m/sec •gravity-fed water-like fluids: <1 m/sec •water-like fluids with settleable solids: >1, <1.5 m/sec •air-like gases: 20 m/sec Keeping the system within these acceptable ranges of superficial velocities, and avoiding two-phase
